1 /* 2 * Virtio Support 3 * 4 * Copyright IBM, Corp. 2007 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #ifndef _QEMU_VIRTIO_H 15 #define _QEMU_VIRTIO_H 16 17 #include "hw/hw.h" 18 #include "net/net.h" 19 #include "hw/qdev.h" 20 #include "sysemu/sysemu.h" 21 #include "qemu/event_notifier.h" 22 #ifdef CONFIG_VIRTFS 23 #include "hw/virtio/virtio-9p.h" 24 #endif 25 26 /* from Linux's linux/virtio_config.h */ 27 28 /* Status byte for guest to report progress, and synchronize features. */ 29 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */ 30 #define VIRTIO_CONFIG_S_ACKNOWLEDGE 1 31 /* We have found a driver for the device. */ 32 #define VIRTIO_CONFIG_S_DRIVER 2 33 /* Driver has used its parts of the config, and is happy */ 34 #define VIRTIO_CONFIG_S_DRIVER_OK 4 35 /* We've given up on this device. */ 36 #define VIRTIO_CONFIG_S_FAILED 0x80 37 38 /* Some virtio feature bits (currently bits 28 through 31) are reserved for the 39 * transport being used (eg. virtio_ring), the rest are per-device feature bits. */ 40 #define VIRTIO_TRANSPORT_F_START 28 41 #define VIRTIO_TRANSPORT_F_END 32 42 43 /* We notify when the ring is completely used, even if the guest is suppressing 44 * callbacks */ 45 #define VIRTIO_F_NOTIFY_ON_EMPTY 24 46 /* We support indirect buffer descriptors */ 47 #define VIRTIO_RING_F_INDIRECT_DESC 28 48 /* The Guest publishes the used index for which it expects an interrupt 49 * at the end of the avail ring. Host should ignore the avail->flags field. */ 50 /* The Host publishes the avail index for which it expects a kick 51 * at the end of the used ring. Guest should ignore the used->flags field. */ 52 #define VIRTIO_RING_F_EVENT_IDX 29 53 /* A guest should never accept this. It implies negotiation is broken. */ 54 #define VIRTIO_F_BAD_FEATURE 30 55 56 /* from Linux's linux/virtio_ring.h */ 57 58 /* This marks a buffer as continuing via the next field. */ 59 #define VRING_DESC_F_NEXT 1 60 /* This marks a buffer as write-only (otherwise read-only). */ 61 #define VRING_DESC_F_WRITE 2 62 /* This means the buffer contains a list of buffer descriptors. */ 63 #define VRING_DESC_F_INDIRECT 4 64 65 /* This means don't notify other side when buffer added. */ 66 #define VRING_USED_F_NO_NOTIFY 1 67 /* This means don't interrupt guest when buffer consumed. */ 68 #define VRING_AVAIL_F_NO_INTERRUPT 1 69 70 struct VirtQueue; 71 72 static inline hwaddr vring_align(hwaddr addr, 73 unsigned long align) 74 { 75 return (addr + align - 1) & ~(align - 1); 76 } 77 78 typedef struct VirtQueue VirtQueue; 79 80 #define VIRTQUEUE_MAX_SIZE 1024 81 82 typedef struct VirtQueueElement 83 { 84 unsigned int index; 85 unsigned int out_num; 86 unsigned int in_num; 87 hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; 88 hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; 89 struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; 90 struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; 91 } VirtQueueElement; 92 93 typedef struct { 94 void (*notify)(DeviceState *d, uint16_t vector); 95 void (*save_config)(DeviceState *d, QEMUFile *f); 96 void (*save_queue)(DeviceState *d, int n, QEMUFile *f); 97 int (*load_config)(DeviceState *d, QEMUFile *f); 98 int (*load_queue)(DeviceState *d, int n, QEMUFile *f); 99 int (*load_done)(DeviceState *d, QEMUFile *f); 100 unsigned (*get_features)(DeviceState *d); 101 bool (*query_guest_notifiers)(DeviceState *d); 102 int (*set_guest_notifiers)(DeviceState *d, int nvqs, bool assigned); 103 int (*set_host_notifier)(DeviceState *d, int n, bool assigned); 104 void (*vmstate_change)(DeviceState *d, bool running); 105 } VirtIOBindings; 106 107 #define VIRTIO_PCI_QUEUE_MAX 64 108 109 #define VIRTIO_NO_VECTOR 0xffff 110 111 #define TYPE_VIRTIO_DEVICE "virtio-device" 112 #define VIRTIO_DEVICE_GET_CLASS(obj) \ 113 OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE) 114 #define VIRTIO_DEVICE_CLASS(klass) \ 115 OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE) 116 #define VIRTIO_DEVICE(obj) \ 117 OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE) 118 119 struct VirtIODevice 120 { 121 DeviceState parent_obj; 122 const char *name; 123 uint8_t status; 124 uint8_t isr; 125 uint16_t queue_sel; 126 uint32_t guest_features; 127 size_t config_len; 128 void *config; 129 uint16_t config_vector; 130 int nvectors; 131 VirtQueue *vq; 132 const VirtIOBindings *binding; 133 DeviceState *binding_opaque; 134 uint16_t device_id; 135 bool vm_running; 136 VMChangeStateEntry *vmstate; 137 }; 138 139 typedef struct VirtioDeviceClass { 140 /* This is what a VirtioDevice must implement */ 141 DeviceClass parent; 142 int (*init)(VirtIODevice *vdev); 143 uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features); 144 uint32_t (*bad_features)(VirtIODevice *vdev); 145 void (*set_features)(VirtIODevice *vdev, uint32_t val); 146 void (*get_config)(VirtIODevice *vdev, uint8_t *config); 147 void (*set_config)(VirtIODevice *vdev, const uint8_t *config); 148 void (*reset)(VirtIODevice *vdev); 149 void (*set_status)(VirtIODevice *vdev, uint8_t val); 150 /* Test and clear event pending status. 151 * Should be called after unmask to avoid losing events. 152 * If backend does not support masking, 153 * must check in frontend instead. 154 */ 155 bool (*guest_notifier_pending)(VirtIODevice *vdev, int n); 156 /* Mask/unmask events from this vq. Any events reported 157 * while masked will become pending. 158 * If backend does not support masking, 159 * must mask in frontend instead. 160 */ 161 void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask); 162 } VirtioDeviceClass; 163 164 void virtio_init(VirtIODevice *vdev, const char *name, 165 uint16_t device_id, size_t config_size); 166 void virtio_common_cleanup(VirtIODevice *vdev); 167 168 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, 169 void (*handle_output)(VirtIODevice *, 170 VirtQueue *)); 171 172 void virtio_del_queue(VirtIODevice *vdev, int n); 173 174 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, 175 unsigned int len); 176 void virtqueue_flush(VirtQueue *vq, unsigned int count); 177 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, 178 unsigned int len, unsigned int idx); 179 180 void virtqueue_map_sg(struct iovec *sg, hwaddr *addr, 181 size_t num_sg, int is_write); 182 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem); 183 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, 184 unsigned int out_bytes); 185 void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, 186 unsigned int *out_bytes, 187 unsigned max_in_bytes, unsigned max_out_bytes); 188 189 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); 190 191 void virtio_save(VirtIODevice *vdev, QEMUFile *f); 192 193 int virtio_load(VirtIODevice *vdev, QEMUFile *f); 194 195 void virtio_cleanup(VirtIODevice *vdev); 196 197 void virtio_notify_config(VirtIODevice *vdev); 198 199 void virtio_queue_set_notification(VirtQueue *vq, int enable); 200 201 int virtio_queue_ready(VirtQueue *vq); 202 203 int virtio_queue_empty(VirtQueue *vq); 204 205 /* Host binding interface. */ 206 207 VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, 208 size_t config_size, size_t struct_size); 209 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr); 210 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr); 211 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr); 212 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data); 213 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data); 214 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data); 215 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr); 216 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n); 217 int virtio_queue_get_num(VirtIODevice *vdev, int n); 218 void virtio_queue_notify(VirtIODevice *vdev, int n); 219 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n); 220 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector); 221 void virtio_set_status(VirtIODevice *vdev, uint8_t val); 222 void virtio_reset(void *opaque); 223 void virtio_update_irq(VirtIODevice *vdev); 224 int virtio_set_features(VirtIODevice *vdev, uint32_t val); 225 226 void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, 227 DeviceState *opaque); 228 229 /* Base devices. */ 230 typedef struct VirtIOBlkConf VirtIOBlkConf; 231 struct virtio_net_conf; 232 VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, 233 struct virtio_net_conf *net, 234 uint32_t host_features); 235 typedef struct virtio_serial_conf virtio_serial_conf; 236 VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *serial); 237 typedef struct VirtIOSCSIConf VirtIOSCSIConf; 238 VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *conf); 239 typedef struct VirtIORNGConf VirtIORNGConf; 240 #ifdef CONFIG_VIRTFS 241 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf); 242 #endif 243 244 245 void virtio_net_exit(VirtIODevice *vdev); 246 void virtio_serial_exit(VirtIODevice *vdev); 247 void virtio_scsi_exit(VirtIODevice *vdev); 248 249 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \ 250 DEFINE_PROP_BIT("indirect_desc", _state, _field, \ 251 VIRTIO_RING_F_INDIRECT_DESC, true), \ 252 DEFINE_PROP_BIT("event_idx", _state, _field, \ 253 VIRTIO_RING_F_EVENT_IDX, true) 254 255 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n); 256 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n); 257 hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n); 258 hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n); 259 hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n); 260 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n); 261 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n); 262 hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n); 263 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n); 264 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx); 265 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n); 266 uint16_t virtio_get_queue_index(VirtQueue *vq); 267 int virtio_queue_get_id(VirtQueue *vq); 268 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq); 269 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, 270 bool with_irqfd); 271 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); 272 void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, 273 bool set_handler); 274 void virtio_queue_notify_vq(VirtQueue *vq); 275 void virtio_irq(VirtQueue *vq); 276 #endif 277